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Basically there are three kinds of errors:
•
Errors detected by the Stand-by software which lead to
protection. These errors will always lead to protection and
an automatic start of the blinking LED.
•
Errors detected by the Stand-by software which not
lead to protection. In this case the front LED should blink
the involved error. Note that it can take up several minutes
before the TV starts blinking the error.
•
Errors detected by main software (MIPS). In this case
the error will be logged into the error buffer and can be read
out via ComPair, or in case picture is visible via SAM.
5.4.2
How to Read the Error Buffer
Use one of the following methods:
•
On screen via the SAM (only when a picture is visible).
E.g.:
–
00 00 00 00 00: No errors detected
–
23 00 00 00 00: Error code 23 is the last and only
detected error.
–
37 23 00 00 00: Error code 23 was first detected and
error code 37 is the last detected error.
–
Note that no protection errors can be logged in the
error buffer.
•
Via the blinking LED procedure. See section
Clear the Error
Buffer.
•
Via ComPair.
5.4.3
How to Clear the Error Buffer
Use one of the following methods:
•
With a normal RC, key in sequence "MUTE" followed by
"062599" and "OK".
•
If the content of the error buffer has not changed for 50+
hours, it resets automatically.
5.4.4
Error Buffer
In case of non-intermittent faults, clear the error buffer before
starting to repair (before clearing the buffer, write down the
content, as this history can give significant information). This to
ensure that old error codes are no longer present.
If possible, check the entire contents of the error buffer. In
some situations, an error code is only the result of another error
code and not the actual cause (e.g. a fault in the protection
detection circuitry can also lead to a protection).
There are several mechanisms of error detection:
•
Via error bits in the status registers of ICs.
•
Via polling on I/O pins going to the stand-by processor.
•
Via sensing of analog values on the stand-by processor.
•
Via a "not acknowledge" of an I
Take notice that some errors need several minutes before they
start blinking or before they will be logged. So in case of
problems wait 2 minutes from start-up onwards, and then
check if the front LED is blinking or if an error is logged.
Table 5-1 Error Code Overview
Error Code
Description
000
No problem
2
011
I
C bus error
012
Tuner error
Service Modes, Error Codes, and Fault Finding
5.4.3 How to
2
C communication.
TPS2.1E LA
5.5
The Blinking LED Procedure
5.5.1
Introduction
The Blinking LED procedure LAYER error 1. In this case the
error is automatically blinked when the TV is put in CSM. This
will be only one digit error, namely the one that is referring to
the defective board which causes the failure of the TV. This
approach will especially be used for home repair and call
centres. The aim here is to have service diagnosis from a
distance.
5.5.2
How to Activate
Use one of the following methods:
•
Activate the CSM. The blinking front LED will show only
the latest layer error 1, this works in "normal operation"
mode or automatically when the error/protection is
monitored by the standby processor. At the time of this
release, this layer error 1 blinking was not working as
expected.
In case no picture is shown and there is no LED blinking,
read the logging to detect whether "error devices" are
mentioned. (see section
Tips").
•
Important remark:
For all errors detected by MIPS which are fatal =>
rebooting of the TV set, one should short the solder paths
at start-up from the power OFF state by mains interruption.
•
Transmit the commands "MUTE" - "062500" - "OK"
with a normal RC. The complete error buffer is shown.
Take notice that it takes some seconds before the blinking
LED starts.
•
Transmit the commands "MUTE" - "06250x" - "OK"
with a normal RC (where "x" is a number between 1
and 5). When x = 1 the last detected error is shown, x = 2
the second last error, etc.... Take notice that it takes some
seconds before the blinking LED starts.
5.6
Protections
5.6.1
Software Protections
Most of the protections and errors use either the stand-by
microprocessor or the MIPS controller as detection device.
Since in these cases, checking of observers, polling of ADCs,
and filtering of input values are all heavily software based,
these protections are referred to as software protections.
There are several types of software related protections, solving
a variety of fault conditions:
•
Protections related to supplies: check of the 12V, +5V,
+3V3 and 1V2.
•
Protections related to breakdown of the safety check
mechanism. E.g. since the protection detections are done
by means of software, failing of the software will have to
initiate a protection mode since safety cannot be
guaranteed any more.
Remark on the Supply Errors
The detection of a supply dip or supply loss during the normal
playing of the set does not lead to a protection, but to a cold
reboot of the set. If the supply is still missing after the reboot,
the TV will go to protection.
Protections during Start-up
During TV start-up, some voltages and IC observers are
actively monitored to be able to optimise the start-up speed,
and to assure good operation of all components. If these
monitors do not respond in a defined way, this indicates a
malfunction of the system and leads to a protection.
5.
EN 15
"5.7 Fault Finding and Repair
2009-Apr-10
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